| 1 | /* |
| 2 | * linux/fs/affs/inode.c |
| 3 | * |
| 4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten |
| 5 | * |
| 6 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. |
| 7 | * |
| 8 | * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. |
| 9 | * |
| 10 | * (C) 1991 Linus Torvalds - minix filesystem |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/statfs.h> |
| 16 | #include <linux/parser.h> |
| 17 | #include <linux/magic.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/writeback.h> |
| 21 | #include "affs.h" |
| 22 | |
| 23 | extern struct timezone sys_tz; |
| 24 | |
| 25 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
| 26 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
| 27 | |
| 28 | static void |
| 29 | affs_commit_super(struct super_block *sb, int wait) |
| 30 | { |
| 31 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 32 | struct buffer_head *bh = sbi->s_root_bh; |
| 33 | struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); |
| 34 | |
| 35 | lock_buffer(bh); |
| 36 | secs_to_datestamp(get_seconds(), &tail->disk_change); |
| 37 | affs_fix_checksum(sb, bh); |
| 38 | unlock_buffer(bh); |
| 39 | |
| 40 | mark_buffer_dirty(bh); |
| 41 | if (wait) |
| 42 | sync_dirty_buffer(bh); |
| 43 | } |
| 44 | |
| 45 | static void |
| 46 | affs_put_super(struct super_block *sb) |
| 47 | { |
| 48 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 49 | pr_debug("%s()\n", __func__); |
| 50 | |
| 51 | cancel_delayed_work_sync(&sbi->sb_work); |
| 52 | } |
| 53 | |
| 54 | static int |
| 55 | affs_sync_fs(struct super_block *sb, int wait) |
| 56 | { |
| 57 | affs_commit_super(sb, wait); |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static void flush_superblock(struct work_struct *work) |
| 62 | { |
| 63 | struct affs_sb_info *sbi; |
| 64 | struct super_block *sb; |
| 65 | |
| 66 | sbi = container_of(work, struct affs_sb_info, sb_work.work); |
| 67 | sb = sbi->sb; |
| 68 | |
| 69 | spin_lock(&sbi->work_lock); |
| 70 | sbi->work_queued = 0; |
| 71 | spin_unlock(&sbi->work_lock); |
| 72 | |
| 73 | affs_commit_super(sb, 1); |
| 74 | } |
| 75 | |
| 76 | void affs_mark_sb_dirty(struct super_block *sb) |
| 77 | { |
| 78 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 79 | unsigned long delay; |
| 80 | |
| 81 | if (sb->s_flags & MS_RDONLY) |
| 82 | return; |
| 83 | |
| 84 | spin_lock(&sbi->work_lock); |
| 85 | if (!sbi->work_queued) { |
| 86 | delay = msecs_to_jiffies(dirty_writeback_interval * 10); |
| 87 | queue_delayed_work(system_long_wq, &sbi->sb_work, delay); |
| 88 | sbi->work_queued = 1; |
| 89 | } |
| 90 | spin_unlock(&sbi->work_lock); |
| 91 | } |
| 92 | |
| 93 | static struct kmem_cache * affs_inode_cachep; |
| 94 | |
| 95 | static struct inode *affs_alloc_inode(struct super_block *sb) |
| 96 | { |
| 97 | struct affs_inode_info *i; |
| 98 | |
| 99 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
| 100 | if (!i) |
| 101 | return NULL; |
| 102 | |
| 103 | i->vfs_inode.i_version = 1; |
| 104 | i->i_lc = NULL; |
| 105 | i->i_ext_bh = NULL; |
| 106 | i->i_pa_cnt = 0; |
| 107 | |
| 108 | return &i->vfs_inode; |
| 109 | } |
| 110 | |
| 111 | static void affs_i_callback(struct rcu_head *head) |
| 112 | { |
| 113 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 114 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
| 115 | } |
| 116 | |
| 117 | static void affs_destroy_inode(struct inode *inode) |
| 118 | { |
| 119 | call_rcu(&inode->i_rcu, affs_i_callback); |
| 120 | } |
| 121 | |
| 122 | static void init_once(void *foo) |
| 123 | { |
| 124 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
| 125 | |
| 126 | sema_init(&ei->i_link_lock, 1); |
| 127 | sema_init(&ei->i_ext_lock, 1); |
| 128 | inode_init_once(&ei->vfs_inode); |
| 129 | } |
| 130 | |
| 131 | static int __init init_inodecache(void) |
| 132 | { |
| 133 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
| 134 | sizeof(struct affs_inode_info), |
| 135 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 136 | SLAB_MEM_SPREAD), |
| 137 | init_once); |
| 138 | if (affs_inode_cachep == NULL) |
| 139 | return -ENOMEM; |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static void destroy_inodecache(void) |
| 144 | { |
| 145 | /* |
| 146 | * Make sure all delayed rcu free inodes are flushed before we |
| 147 | * destroy cache. |
| 148 | */ |
| 149 | rcu_barrier(); |
| 150 | kmem_cache_destroy(affs_inode_cachep); |
| 151 | } |
| 152 | |
| 153 | static const struct super_operations affs_sops = { |
| 154 | .alloc_inode = affs_alloc_inode, |
| 155 | .destroy_inode = affs_destroy_inode, |
| 156 | .write_inode = affs_write_inode, |
| 157 | .evict_inode = affs_evict_inode, |
| 158 | .put_super = affs_put_super, |
| 159 | .sync_fs = affs_sync_fs, |
| 160 | .statfs = affs_statfs, |
| 161 | .remount_fs = affs_remount, |
| 162 | .show_options = generic_show_options, |
| 163 | }; |
| 164 | |
| 165 | enum { |
| 166 | Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, |
| 167 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
| 168 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
| 169 | }; |
| 170 | |
| 171 | static const match_table_t tokens = { |
| 172 | {Opt_bs, "bs=%u"}, |
| 173 | {Opt_mode, "mode=%o"}, |
| 174 | {Opt_mufs, "mufs"}, |
| 175 | {Opt_notruncate, "nofilenametruncate"}, |
| 176 | {Opt_prefix, "prefix=%s"}, |
| 177 | {Opt_protect, "protect"}, |
| 178 | {Opt_reserved, "reserved=%u"}, |
| 179 | {Opt_root, "root=%u"}, |
| 180 | {Opt_setgid, "setgid=%u"}, |
| 181 | {Opt_setuid, "setuid=%u"}, |
| 182 | {Opt_verbose, "verbose"}, |
| 183 | {Opt_volume, "volume=%s"}, |
| 184 | {Opt_ignore, "grpquota"}, |
| 185 | {Opt_ignore, "noquota"}, |
| 186 | {Opt_ignore, "quota"}, |
| 187 | {Opt_ignore, "usrquota"}, |
| 188 | {Opt_err, NULL}, |
| 189 | }; |
| 190 | |
| 191 | static int |
| 192 | parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, |
| 193 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
| 194 | { |
| 195 | char *p; |
| 196 | substring_t args[MAX_OPT_ARGS]; |
| 197 | |
| 198 | /* Fill in defaults */ |
| 199 | |
| 200 | *uid = current_uid(); |
| 201 | *gid = current_gid(); |
| 202 | *reserved = 2; |
| 203 | *root = -1; |
| 204 | *blocksize = -1; |
| 205 | volume[0] = ':'; |
| 206 | volume[1] = 0; |
| 207 | *mount_opts = 0; |
| 208 | if (!options) |
| 209 | return 1; |
| 210 | |
| 211 | while ((p = strsep(&options, ",")) != NULL) { |
| 212 | int token, n, option; |
| 213 | if (!*p) |
| 214 | continue; |
| 215 | |
| 216 | token = match_token(p, tokens, args); |
| 217 | switch (token) { |
| 218 | case Opt_bs: |
| 219 | if (match_int(&args[0], &n)) |
| 220 | return 0; |
| 221 | if (n != 512 && n != 1024 && n != 2048 |
| 222 | && n != 4096) { |
| 223 | pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
| 224 | return 0; |
| 225 | } |
| 226 | *blocksize = n; |
| 227 | break; |
| 228 | case Opt_mode: |
| 229 | if (match_octal(&args[0], &option)) |
| 230 | return 0; |
| 231 | *mode = option & 0777; |
| 232 | *mount_opts |= SF_SETMODE; |
| 233 | break; |
| 234 | case Opt_mufs: |
| 235 | *mount_opts |= SF_MUFS; |
| 236 | break; |
| 237 | case Opt_notruncate: |
| 238 | *mount_opts |= SF_NO_TRUNCATE; |
| 239 | break; |
| 240 | case Opt_prefix: |
| 241 | *prefix = match_strdup(&args[0]); |
| 242 | if (!*prefix) |
| 243 | return 0; |
| 244 | *mount_opts |= SF_PREFIX; |
| 245 | break; |
| 246 | case Opt_protect: |
| 247 | *mount_opts |= SF_IMMUTABLE; |
| 248 | break; |
| 249 | case Opt_reserved: |
| 250 | if (match_int(&args[0], reserved)) |
| 251 | return 0; |
| 252 | break; |
| 253 | case Opt_root: |
| 254 | if (match_int(&args[0], root)) |
| 255 | return 0; |
| 256 | break; |
| 257 | case Opt_setgid: |
| 258 | if (match_int(&args[0], &option)) |
| 259 | return 0; |
| 260 | *gid = make_kgid(current_user_ns(), option); |
| 261 | if (!gid_valid(*gid)) |
| 262 | return 0; |
| 263 | *mount_opts |= SF_SETGID; |
| 264 | break; |
| 265 | case Opt_setuid: |
| 266 | if (match_int(&args[0], &option)) |
| 267 | return 0; |
| 268 | *uid = make_kuid(current_user_ns(), option); |
| 269 | if (!uid_valid(*uid)) |
| 270 | return 0; |
| 271 | *mount_opts |= SF_SETUID; |
| 272 | break; |
| 273 | case Opt_verbose: |
| 274 | *mount_opts |= SF_VERBOSE; |
| 275 | break; |
| 276 | case Opt_volume: { |
| 277 | char *vol = match_strdup(&args[0]); |
| 278 | if (!vol) |
| 279 | return 0; |
| 280 | strlcpy(volume, vol, 32); |
| 281 | kfree(vol); |
| 282 | break; |
| 283 | } |
| 284 | case Opt_ignore: |
| 285 | /* Silently ignore the quota options */ |
| 286 | break; |
| 287 | default: |
| 288 | pr_warn("Unrecognized mount option \"%s\" or missing value\n", |
| 289 | p); |
| 290 | return 0; |
| 291 | } |
| 292 | } |
| 293 | return 1; |
| 294 | } |
| 295 | |
| 296 | /* This function definitely needs to be split up. Some fine day I'll |
| 297 | * hopefully have the guts to do so. Until then: sorry for the mess. |
| 298 | */ |
| 299 | |
| 300 | static int affs_fill_super(struct super_block *sb, void *data, int silent) |
| 301 | { |
| 302 | struct affs_sb_info *sbi; |
| 303 | struct buffer_head *root_bh = NULL; |
| 304 | struct buffer_head *boot_bh; |
| 305 | struct inode *root_inode = NULL; |
| 306 | s32 root_block; |
| 307 | int size, blocksize; |
| 308 | u32 chksum; |
| 309 | int num_bm; |
| 310 | int i, j; |
| 311 | s32 key; |
| 312 | kuid_t uid; |
| 313 | kgid_t gid; |
| 314 | int reserved; |
| 315 | unsigned long mount_flags; |
| 316 | int tmp_flags; /* fix remount prototype... */ |
| 317 | u8 sig[4]; |
| 318 | int ret; |
| 319 | |
| 320 | save_mount_options(sb, data); |
| 321 | |
| 322 | pr_debug("read_super(%s)\n", data ? (const char *)data : "no options"); |
| 323 | |
| 324 | sb->s_magic = AFFS_SUPER_MAGIC; |
| 325 | sb->s_op = &affs_sops; |
| 326 | sb->s_flags |= MS_NODIRATIME; |
| 327 | |
| 328 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
| 329 | if (!sbi) |
| 330 | return -ENOMEM; |
| 331 | |
| 332 | sb->s_fs_info = sbi; |
| 333 | sbi->sb = sb; |
| 334 | mutex_init(&sbi->s_bmlock); |
| 335 | spin_lock_init(&sbi->symlink_lock); |
| 336 | spin_lock_init(&sbi->work_lock); |
| 337 | INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); |
| 338 | |
| 339 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
| 340 | &blocksize,&sbi->s_prefix, |
| 341 | sbi->s_volume, &mount_flags)) { |
| 342 | pr_err("Error parsing options\n"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | /* N.B. after this point s_prefix must be released */ |
| 346 | |
| 347 | sbi->s_flags = mount_flags; |
| 348 | sbi->s_mode = i; |
| 349 | sbi->s_uid = uid; |
| 350 | sbi->s_gid = gid; |
| 351 | sbi->s_reserved= reserved; |
| 352 | |
| 353 | /* Get the size of the device in 512-byte blocks. |
| 354 | * If we later see that the partition uses bigger |
| 355 | * blocks, we will have to change it. |
| 356 | */ |
| 357 | |
| 358 | size = sb->s_bdev->bd_inode->i_size >> 9; |
| 359 | pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size); |
| 360 | |
| 361 | affs_set_blocksize(sb, PAGE_SIZE); |
| 362 | /* Try to find root block. Its location depends on the block size. */ |
| 363 | |
| 364 | i = 512; |
| 365 | j = 4096; |
| 366 | if (blocksize > 0) { |
| 367 | i = j = blocksize; |
| 368 | size = size / (blocksize / 512); |
| 369 | } |
| 370 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { |
| 371 | sbi->s_root_block = root_block; |
| 372 | if (root_block < 0) |
| 373 | sbi->s_root_block = (reserved + size - 1) / 2; |
| 374 | pr_debug("setting blocksize to %d\n", blocksize); |
| 375 | affs_set_blocksize(sb, blocksize); |
| 376 | sbi->s_partition_size = size; |
| 377 | |
| 378 | /* The root block location that was calculated above is not |
| 379 | * correct if the partition size is an odd number of 512- |
| 380 | * byte blocks, which will be rounded down to a number of |
| 381 | * 1024-byte blocks, and if there were an even number of |
| 382 | * reserved blocks. Ideally, all partition checkers should |
| 383 | * report the real number of blocks of the real blocksize, |
| 384 | * but since this just cannot be done, we have to try to |
| 385 | * find the root block anyways. In the above case, it is one |
| 386 | * block behind the calculated one. So we check this one, too. |
| 387 | */ |
| 388 | for (num_bm = 0; num_bm < 2; num_bm++) { |
| 389 | pr_debug("Dev %s, trying root=%u, bs=%d, " |
| 390 | "size=%d, reserved=%d\n", |
| 391 | sb->s_id, |
| 392 | sbi->s_root_block + num_bm, |
| 393 | blocksize, size, reserved); |
| 394 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); |
| 395 | if (!root_bh) |
| 396 | continue; |
| 397 | if (!affs_checksum_block(sb, root_bh) && |
| 398 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
| 399 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
| 400 | sbi->s_hashsize = blocksize / 4 - 56; |
| 401 | sbi->s_root_block += num_bm; |
| 402 | key = 1; |
| 403 | goto got_root; |
| 404 | } |
| 405 | affs_brelse(root_bh); |
| 406 | root_bh = NULL; |
| 407 | } |
| 408 | } |
| 409 | if (!silent) |
| 410 | pr_err("No valid root block on device %s\n", sb->s_id); |
| 411 | return -EINVAL; |
| 412 | |
| 413 | /* N.B. after this point bh must be released */ |
| 414 | got_root: |
| 415 | /* Keep super block in cache */ |
| 416 | sbi->s_root_bh = root_bh; |
| 417 | root_block = sbi->s_root_block; |
| 418 | |
| 419 | /* Find out which kind of FS we have */ |
| 420 | boot_bh = sb_bread(sb, 0); |
| 421 | if (!boot_bh) { |
| 422 | pr_err("Cannot read boot block\n"); |
| 423 | return -EINVAL; |
| 424 | } |
| 425 | memcpy(sig, boot_bh->b_data, 4); |
| 426 | brelse(boot_bh); |
| 427 | chksum = be32_to_cpu(*(__be32 *)sig); |
| 428 | |
| 429 | /* Dircache filesystems are compatible with non-dircache ones |
| 430 | * when reading. As long as they aren't supported, writing is |
| 431 | * not recommended. |
| 432 | */ |
| 433 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
| 434 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { |
| 435 | pr_notice("Dircache FS - mounting %s read only\n", sb->s_id); |
| 436 | sb->s_flags |= MS_RDONLY; |
| 437 | } |
| 438 | switch (chksum) { |
| 439 | case MUFS_FS: |
| 440 | case MUFS_INTLFFS: |
| 441 | case MUFS_DCFFS: |
| 442 | sbi->s_flags |= SF_MUFS; |
| 443 | /* fall thru */ |
| 444 | case FS_INTLFFS: |
| 445 | case FS_DCFFS: |
| 446 | sbi->s_flags |= SF_INTL; |
| 447 | break; |
| 448 | case MUFS_FFS: |
| 449 | sbi->s_flags |= SF_MUFS; |
| 450 | break; |
| 451 | case FS_FFS: |
| 452 | break; |
| 453 | case MUFS_OFS: |
| 454 | sbi->s_flags |= SF_MUFS; |
| 455 | /* fall thru */ |
| 456 | case FS_OFS: |
| 457 | sbi->s_flags |= SF_OFS; |
| 458 | sb->s_flags |= MS_NOEXEC; |
| 459 | break; |
| 460 | case MUFS_DCOFS: |
| 461 | case MUFS_INTLOFS: |
| 462 | sbi->s_flags |= SF_MUFS; |
| 463 | case FS_DCOFS: |
| 464 | case FS_INTLOFS: |
| 465 | sbi->s_flags |= SF_INTL | SF_OFS; |
| 466 | sb->s_flags |= MS_NOEXEC; |
| 467 | break; |
| 468 | default: |
| 469 | pr_err("Unknown filesystem on device %s: %08X\n", |
| 470 | sb->s_id, chksum); |
| 471 | return -EINVAL; |
| 472 | } |
| 473 | |
| 474 | if (mount_flags & SF_VERBOSE) { |
| 475 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
| 476 | pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
| 477 | len > 31 ? 31 : len, |
| 478 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
| 479 | sig, sig[3] + '0', blocksize); |
| 480 | } |
| 481 | |
| 482 | sb->s_flags |= MS_NODEV | MS_NOSUID; |
| 483 | |
| 484 | sbi->s_data_blksize = sb->s_blocksize; |
| 485 | if (sbi->s_flags & SF_OFS) |
| 486 | sbi->s_data_blksize -= 24; |
| 487 | |
| 488 | tmp_flags = sb->s_flags; |
| 489 | ret = affs_init_bitmap(sb, &tmp_flags); |
| 490 | if (ret) |
| 491 | return ret; |
| 492 | sb->s_flags = tmp_flags; |
| 493 | |
| 494 | /* set up enough so that it can read an inode */ |
| 495 | |
| 496 | root_inode = affs_iget(sb, root_block); |
| 497 | if (IS_ERR(root_inode)) |
| 498 | return PTR_ERR(root_inode); |
| 499 | |
| 500 | if (AFFS_SB(sb)->s_flags & SF_INTL) |
| 501 | sb->s_d_op = &affs_intl_dentry_operations; |
| 502 | else |
| 503 | sb->s_d_op = &affs_dentry_operations; |
| 504 | |
| 505 | sb->s_root = d_make_root(root_inode); |
| 506 | if (!sb->s_root) { |
| 507 | pr_err("AFFS: Get root inode failed\n"); |
| 508 | return -ENOMEM; |
| 509 | } |
| 510 | |
| 511 | pr_debug("s_flags=%lX\n", sb->s_flags); |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static int |
| 516 | affs_remount(struct super_block *sb, int *flags, char *data) |
| 517 | { |
| 518 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 519 | int blocksize; |
| 520 | kuid_t uid; |
| 521 | kgid_t gid; |
| 522 | int mode; |
| 523 | int reserved; |
| 524 | int root_block; |
| 525 | unsigned long mount_flags; |
| 526 | int res = 0; |
| 527 | char *new_opts = kstrdup(data, GFP_KERNEL); |
| 528 | char volume[32]; |
| 529 | char *prefix = NULL; |
| 530 | |
| 531 | pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data); |
| 532 | |
| 533 | sync_filesystem(sb); |
| 534 | *flags |= MS_NODIRATIME; |
| 535 | |
| 536 | memcpy(volume, sbi->s_volume, 32); |
| 537 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
| 538 | &blocksize, &prefix, volume, |
| 539 | &mount_flags)) { |
| 540 | kfree(prefix); |
| 541 | kfree(new_opts); |
| 542 | return -EINVAL; |
| 543 | } |
| 544 | |
| 545 | flush_delayed_work(&sbi->sb_work); |
| 546 | replace_mount_options(sb, new_opts); |
| 547 | |
| 548 | sbi->s_flags = mount_flags; |
| 549 | sbi->s_mode = mode; |
| 550 | sbi->s_uid = uid; |
| 551 | sbi->s_gid = gid; |
| 552 | /* protect against readers */ |
| 553 | spin_lock(&sbi->symlink_lock); |
| 554 | if (prefix) { |
| 555 | kfree(sbi->s_prefix); |
| 556 | sbi->s_prefix = prefix; |
| 557 | } |
| 558 | memcpy(sbi->s_volume, volume, 32); |
| 559 | spin_unlock(&sbi->symlink_lock); |
| 560 | |
| 561 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 562 | return 0; |
| 563 | |
| 564 | if (*flags & MS_RDONLY) |
| 565 | affs_free_bitmap(sb); |
| 566 | else |
| 567 | res = affs_init_bitmap(sb, flags); |
| 568 | |
| 569 | return res; |
| 570 | } |
| 571 | |
| 572 | static int |
| 573 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 574 | { |
| 575 | struct super_block *sb = dentry->d_sb; |
| 576 | int free; |
| 577 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
| 578 | |
| 579 | pr_debug("%s() partsize=%d, reserved=%d\n", |
| 580 | __func__, AFFS_SB(sb)->s_partition_size, |
| 581 | AFFS_SB(sb)->s_reserved); |
| 582 | |
| 583 | free = affs_count_free_blocks(sb); |
| 584 | buf->f_type = AFFS_SUPER_MAGIC; |
| 585 | buf->f_bsize = sb->s_blocksize; |
| 586 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
| 587 | buf->f_bfree = free; |
| 588 | buf->f_bavail = free; |
| 589 | buf->f_fsid.val[0] = (u32)id; |
| 590 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 591 | buf->f_namelen = 30; |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
| 596 | int flags, const char *dev_name, void *data) |
| 597 | { |
| 598 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
| 599 | } |
| 600 | |
| 601 | static void affs_kill_sb(struct super_block *sb) |
| 602 | { |
| 603 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 604 | kill_block_super(sb); |
| 605 | if (sbi) { |
| 606 | affs_free_bitmap(sb); |
| 607 | affs_brelse(sbi->s_root_bh); |
| 608 | kfree(sbi->s_prefix); |
| 609 | kfree(sbi); |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | static struct file_system_type affs_fs_type = { |
| 614 | .owner = THIS_MODULE, |
| 615 | .name = "affs", |
| 616 | .mount = affs_mount, |
| 617 | .kill_sb = affs_kill_sb, |
| 618 | .fs_flags = FS_REQUIRES_DEV, |
| 619 | }; |
| 620 | MODULE_ALIAS_FS("affs"); |
| 621 | |
| 622 | static int __init init_affs_fs(void) |
| 623 | { |
| 624 | int err = init_inodecache(); |
| 625 | if (err) |
| 626 | goto out1; |
| 627 | err = register_filesystem(&affs_fs_type); |
| 628 | if (err) |
| 629 | goto out; |
| 630 | return 0; |
| 631 | out: |
| 632 | destroy_inodecache(); |
| 633 | out1: |
| 634 | return err; |
| 635 | } |
| 636 | |
| 637 | static void __exit exit_affs_fs(void) |
| 638 | { |
| 639 | unregister_filesystem(&affs_fs_type); |
| 640 | destroy_inodecache(); |
| 641 | } |
| 642 | |
| 643 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
| 644 | MODULE_LICENSE("GPL"); |
| 645 | |
| 646 | module_init(init_affs_fs) |
| 647 | module_exit(exit_affs_fs) |